BQ76PL455APFCT datasheet(111/125 Pages) TI1

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bq76PL455A

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SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

Product Folder Links: bq76PL455A

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Typical Application (continued)

8.2.2.5 Balance Resistor

The balance resistor (R15 and R16) sets the required balance current. If used, the resistors in series with the cell

connections (top and bottom, in front of the zener diode) must be included in this calculation. These resistors

must be sized appropriately to handle the thermal dissipation of continuous cell balancing.

8.2.2.6 WAKEUP Pin

The WAKEUP pin input requires a pull-down to ensure it is not left unconnected and cause an unintended

wakeup (active high).

8.3 Initialization Set Up

8.3.1 Factory Configuration Summary

When the bq76PL455A leaves the factory, its EEPROM memory holds a configuration suitable for many

applications, but may need some adjustment for your design.

From the factory (see Register Summary):

1. The address is set to 0x00.

2. All digital and communications faults are enabled.

3. All analog faults (OV, UV) are disabled (masked).

4. Any fault that occurs and is not masked will control the FAULT_N and FAULTL± outputs.

5. Sampling is set for 8-sample averaging, 60 µs for the first sample, and 12.6 µs for the other samples (7).

This setup requires a 390-pF capacitor on pin OUT1.

6. All sixteen VSENSE inputs and no AUX channels are enabled for conversions.

7. No user-settable gain or offset corrections are applied to the VSENSE or AUX ADC channels – these allow

post-assembly or end-of-line corrections to ADC results.

8. The UART interface is enabled at 250 Kbaud.

9. GPIO pins are all programmed as inputs, no pull-up or pull-down resistor is enabled, leaving the inputs

floating. The pins should be reprogrammed to become outputs, or inputs with a pull-up/down enabled if none

are provided externally. The pins should not be allowed to remain as floating inputs, because unpredictable

operation is possible accompanied by excess current draw.

BQ76PL455APFCT Datasheet(PDF) 111 Page - Texas Instruments